Decided it’s time to get my son a BMX and wondered what people recommend for a 4 year old?

He’s gone from balance bike to pedal bike in last year without any difficulty and has been going the local BMX park for a while now(with a little help from dad) and has been doing well on a standard child’s bike considering how heavy it is.

Anyway it’s his birthday next week so I’m going to treat him

Any suggestions appreciated